Condensed Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income attributable to the controlling and noncontrolling interests	$ 392	$ 371	$ 1,693	$ 2,816
Other comprehensive income (loss), net of tax:
Defined benefit pension and other postretirement benefits	14	17	25	198
Unrealized foreign currency translation adjustments	41	(59)	58	(190)
Unrealized losses on marketable securities	0	1	0	1
Net change – derivative financial instruments	(3)	2	0	7
Other comprehensive income (loss), net of tax	52	(39)	83	16
Total comprehensive income	444	332	1,776	2,832
Less: amounts attributable to noncontrolling interests:
Net income	(6)	(30)	(45)	(65)
Unrealized foreign currency translation adjustments	(3)	8	(4)	11
Comprehensive income attributable to PPG	$ 435	$ 310	$ 1,727	$ 2,778